Secure cross-platform messaging

Backchat keeps private conversations fast, local, and easy to install.

Backchat is a Flutter-based messenger with local conversation history, unread badges, online presence, and one-to-one voice and video calls that can prefer direct or VPN-friendly routes.

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Latest build
Backchat 0.1.0+5
Tag
v0.1.0-build.5
Published
March 27, 2026
Why people pick Backchat
  • Local chat history on each computer
  • Unread counts in the app and taskbar
  • Online/offline presence and profile quotes
  • Voice and video calls with direct/VPN-aware routing
Delivery model

Messages sync through the hosted API, while voice and video prefer peer-to-peer media paths when networks allow it.

Latest downloads

One clear place to grab the current build for every platform.

These links are generated from the latest GitHub Release so the page stays current as new installers and bundles are published.

Play

Android App Bundle

Play Store-ready Android App Bundle for publishing and staged rollout workflows.

AAB 57.8 MB
Download AAB View release notes

What’s inside

Built for private conversation, not just polished screenshots.

Focused desktop experience

Contact-side unread counters, taskbar badges, quick contact switching, and conversation focus that feels like a real desktop messenger.

Local-first history

Conversation logs are cached per machine so your message history and unread state stay available locally without turning the server into your archive.

Presence and profiles

Contacts can see avatar, quote, and online state at a glance so the contact list works like a useful dashboard, not just a list of names.

Direct-friendly calling

Voice and video calls use WebRTC signaling with advanced routing controls for auto, direct/VPN-preferred, direct-only, or relay-only behavior.

Security snapshot

Practical encryption with room to grow.

Backchat already ships encrypted-message primitives, presence, and direct-call signaling. The project is structured so you can keep strengthening the transport and device story over time.

Encrypted messaging primitives

X25519 key exchange and AES-GCM are already in the app scaffold for message protection.

Direct media when possible

Voice and video attempt peer-to-peer routing first, with relay fallback as an option when network conditions need it.

Transparent release checksums

The latest release digests are published here so testers can verify exactly what they downloaded.

Verification

Latest asset SHA-256 digests

Generated from the latest GitHub Release metadata on March 27, 2026 at 16:53 UTC.

Asset SHA-256
backchat-android-0.1.0+5.aab f358ec61b79d60a2b64f7c5fdbf3aa2b8e7e157422ba81b207aadd4fb8eac686
backchat-android-0.1.0+5.apk 7f3713eadce771be5a5344de0f46b4ac43c4cea770d9e5da855bce674c6f4db9
backchat-linux-x64-0.1.0+5.tar.gz cbce9d16abfaa65af617e1837cd8f2a0dc70a6705506f0fd3259ae9fd8d6224c
backchat-macos-0.1.0+5.zip bd4eff2ffed9e2d2722d5df471ad8d3c41b01c20eeed3de5441600552ab473ac
backchat-windows-x64-0.1.0+5.zip 7ee5a8eff8a5085083f3af83e242b87d0ddaba0b5ffcff1a1617aeed10604ac6